Products Description
Product Specifications
| Standards | ASTM A789 / ASTM A789M |
| Steel Grades | S32750 (2507) S32760 S32707 S32520 S32550 S32950 S32808 S33207 S39274 S39277,etc. |
| Equivalent Standards | EN 10216-5, NACE MR0175, ISO 15156 |
| Outer Diameter (OD) |
6.0 mm - 630 mm
|
| Wall Thickness (WT) | 0.5mm-55mm |
| Length | 6/12 m, customized |
| Surface Treatment | Pickling & Passivation |
| Production Process | Hot Rolled, Cold Drawn, Cold Rolled |
| Condition | Solution annealed |
Super Duplex 2507 pipe has a PREN ≥ 42 and a CPT (critical pitting temperature) ≈ of 85℃, making it resistant to corrosion from high-temperature seawater, concentrated brine (20% NaCl), deep-sea/offshore splash zones, and acidic brines.
The minimum yield strength of 2507 is as high as 550 MPa (80 ksi), approximately three times that of 316L and significantly higher than that of standard duplex steel 2205 (≥450 MPa), allowing for thinner-walled designs and reduced material costs.
Super duplex stainless steel 2507 exhibits reduced toughness and corrosion resistance at high temperatures; therefore, the recommended operating temperature is no higher than 316℃ (600°F). The minimum operating temperature can reach -50℃.
Customized Services
- TORICH offers customization for non-standard dimensions, covering outer diameters of 6mm–630mm, wall thicknesses of 0.5mm–55mm, and lengths ranging from 3 to 12 meters.
- End-processing services are available, including standard or special beveling (V-type, U-type, double-V), threading (NPT, BSP, API), and prefabricated flange welding.
- In addition to standard pickling, surface treatments such as electropolishing (Ra ≤ 0.4μm), bright annealing, sandblasting, and internal honing are available.
Chemical Composition
| Grade | Cr | Ni | Mo | N | Mn | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 2507 (UNS S32750) | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | ≤1.20 | ≤0.80 | ≤0.030 | ≤0.035 | ≤0.020 | Balance |
Mechanical Properties
| Grade | Yield Strength (Rp0.2) | Tensile Strength | Elongation | Hardness |
|---|---|---|---|---|
| 2507 (UNS S32750) | ≥ 550 MPa | ≥ 800 MPa | ≥ 15–25% | ≤ 32 HRC |
Possible Alternative Grades
- For more aggressive oil and gas wells, desulfurization units, and acid pickling systems, Zeron 100 (UNS S32760) is an option; it offers superior corrosion resistance, though the cost is approximately 15–25% higher than that of 2507.
- For gathering and transmission pipelines with lower acidity and no H₂S content, 2205 is a suitable choice; it is less expensive than 2507 and easier to fabricate and weld.
- For applications requiring high corrosion resistance but only moderate strength, 254SMO or 904L can be selected, as they withstand high temperatures and high acid concentrations.
application areas
- Subsea flowlines and production pipelines
- High-pressure water injection systems
- Sour gas (H₂S) production systems
- Offshore platform process piping
- Hydraulic and control piping
- Seawater system heat exchanger tubing
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Factory Equipment
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FAQ
Q: What precautions should be taken when welding 2507 steel pipes?
A: Use matching 2507 filler wire (e.g., ER2594), control heat input to ≤1.5 kJ/mm, and maintain an interpass temperature of ≤150°C. Post-weld heat treatment is not required, but care must be taken to ensure no harmful phases precipitate in the heat-affected zone (HAZ).
Q: What corrosion tests are performed on 2507 steel pipes?
A: Standard tests include intergranular corrosion testing (ASTM A262 Practice E) and pitting corrosion testing (ASTM G48 Method A). For the oil and gas industry, additional tests such as SSCC (NACE TM0177), HIC (NACE TM0284), and crevice corrosion testing can be conducted.
Q: Do you exclusively manufacture seamless pipes? Can you supply welded pipes?
A: We also supply ASTM A790 welded pipes and ASTM A928 welded and cold-worked pipes to meet various pressure rating requirements.
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